Cherry-pick #18666 to 7.x: [Elastic Agent] Fix the platform reporting and the family reporting.

[ph]

Cherry-pick of PR #18666 to 7.x branch. Original message:

This PR fixes:

• Report Family correctly: redhat/debian.
• Report the platform correctly Centos for Centos instead of redhat.

Fixes: #18665

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• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

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💚 Build Succeeded

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• Build Cause: [Pull request #18731 opened]

• Start Time: 2020-05-25T17:25:08.019+0000

• Duration: 34 min 48 sec

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• Name: Report to Codecov

  • Description: curl -sSLo codecov https://codecov.io/bash for i in auditbeat filebeat heartbeat libbeat metricbeat packetbeat winlogbeat journalbeat do FILE="${i}/build/coverage/full.cov" if [ -f "${FILE}" ]; then bash codecov -f "${FILE}" fi done

  • Duration: 2 min 22 sec

  • Start Time: 2020-05-25T17:52:25.441+0000

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Pinging @elastic/ingest-management (Team:Ingest Management)

[michalpristas]

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• Build Cause: [Pull request #18731 updated]

• Start Time: 2020-05-27T15:23:55.375+0000

• Duration: 33 min 49 sec